Ammonia-lithium nitrate absorption chiller with an integrated low-pressure compression booster cycle for low driving temperatures.

Abstract Single-effect absorption refrigeration hybridized with mechanical vapor compression in a vapor circuit is known as the absorption cycle with an integrated booster compressor. In this study, the compressor is located between the evaporator and the absorber. This paper presents a numerical model of this cycle with ammonia-lithium nitrate solution as the working pair. It is based on UA−ΔTlm models for separate regions of plate-type heat exchangers. The results are offered as a function of external circuit flow parameters. Different pressure ratios of the compressor were tested for a wide range of hot water driving temperatures (55–95 °C), showing that low values are more beneficial. This cycle allows for working at lower driving temperatures than the single-effect cycle, with low electricity consumption. At the same driving temperature, the capacity is augmented with an increased compressor pressure ratio, thus allowing for demand matching of the cooling. This cycle, operating with hot water at 67 °C with a pressure ratio of 2.0, has the capacity of a single-effect absorption cycle at 94 °C. The electrical COP was found to be higher than that in an ammonia vapor compression cycle for comprehensive working conditions.

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